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標記圖中的平行邊

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標記圖中的平行邊

我想標記我的邊緣，如下例所示：

殘差圖

然而，此時，節點標籤總是出現在邊緣的正上方，我很難單獨排列節點標籤 -

這是代碼：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc}

% Syntax:
% \DoublLine[half of the double line distance]{first node}{second node}{options line 1}{options line 2}
\newcommand\DoubleLine[5][4pt]{%
    \path(#2)--(#3)coordinate[at start](h1)coordinate[at end](h2);
    \draw[#4]($(h1)!#1!90:(h2)$)--($(h2)!#1!-90:(h1)$); 
    % node [midway, above=1pt, fill=none] {3};
    \draw[#5]($(h1)!#1!-90:(h2)$)--($(h2)!#1!90:(h1)$); 
    % node [midway, below=1pt, fill=none] {3};
    }

\begin{document}
    \begin{tikzpicture}[myn/.style={circle,very thick,draw,inner sep=0.25cm,outer sep=3pt}]

    \node[myn] (s) at (0,2) {s};
    \node[myn] (a) at (2,4) {a};
    \node[myn] (b) at (2,0) {b};
    \node[myn] (c) at (5,4) {c};
    \node[myn] (d) at (5,0) {d};
    \node[myn] (t) at (7,2) {t};

    \DoubleLine{s}{a}{<-,very thick,black}{->,very thick,red}
    \DoubleLine{s}{b}{<-,very thick,black}{->,very thick,red}
    \DoubleLine{a}{b}{<-,very thick,black}{->,very thick,red}
    \DoubleLine{a}{c}{<-,very thick,black}{->,very thick,red}
    \DoubleLine{b}{d}{<-,very thick,black}{->,very thick,red}
    \DoubleLine{c}{t}{<-,very thick,black}{->,very thick,red}
    \DoubleLine{d}{t}{<-,very thick,black}{->,very thick,red} 

    \end{tikzpicture}
\end{document}

答案1

除了扎科的答案之外，並且可能對您自己的程式碼進行較少的修改，您可能有：

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc}

% Syntax:
% \DoublLine[half of the double line distance]{first node}{second node}{options line 1}{label line 1}{options line 2}{label line 2}
\newcommand\DoubleLine[7][4pt]{%
    \path(#2)--(#3)coordinate[at start](h1)coordinate[at end](h2);
    \draw[#4]($(h1)!#1!90:(h2)$)-- node [auto=left] {#5} ($(h2)!#1!-90:(h1)$); 
    \draw[#6]($(h1)!#1!-90:(h2)$)-- node [auto=right] {#7} ($(h2)!#1!90:(h1)$);
    }

\begin{document}
    \begin{tikzpicture}[myn/.style={circle,very thick,draw,inner sep=0.25cm,outer sep=3pt}]

    \node[myn] (s) at (0,2) {s};
    \node[myn] (a) at (2,4) {a};
    \node[myn] (b) at (2,0) {b};
    \node[myn] (c) at (5,4) {c};
    \node[myn] (d) at (5,0) {d};
    \node[myn] (t) at (7,2) {t};

    \DoubleLine{s}{a}{<-,very thick,black}{1}{->,very thick,red}{7}
    \DoubleLine{s}{b}{<-,very thick,black}{2}{->,very thick,red}{6}
    \DoubleLine{a}{b}{<-,very thick,black}{3}{->,very thick,red}{5}
    \DoubleLine{a}{c}{<-,very thick,black}{4}{->,very thick,red}{4}
    \DoubleLine{b}{d}{<-,very thick,black}{5}{->,very thick,red}{3}
    \DoubleLine{c}{t}{<-,very thick,black}{6}{->,very thick,red}{2}
    \DoubleLine{d}{t}{<-,very thick,black}{7}{->,very thick,red}{1}

    \end{tikzpicture}
\end{document}

其產生：

快照

有關該auto選項的更多信息，您可能需要諮詢pgf手冊，第 17.8 節，第 236 頁）。

答案2

像這樣：

在此輸入影像描述

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc, quotes}

% Syntax:
% \DoublLine[half of the double line distance]{first node}{second node}{options line 1}{options line 2}
\newcommand\DoubleLine[5][4pt]{%
    \path(#2)--(#3)coordinate[at start](h1)coordinate[at end](h2);
    \draw[<-,very thick,black] ($(h1)!#1!90:(h2)$)  to ["#4"]   ($(h2)!#1!-90:(h1)$);
    \draw[->,very thick,  red] ($(h1)!#1!-90:(h2)$) to ["#5" '] ($(h2)!#1!90:(h1)$);
    }

\begin{document}
    \begin{tikzpicture}[
myn/.style={circle,very thick,draw,inner sep=0.25cm,outer sep=3pt}
                        ]
    \node[myn] (s) at (0,2) {s};
    \node[myn] (a) at (2,4) {a};

    \DoubleLine{s}{a}{1}{2}

    \end{tikzpicture}
\end{document}

編輯： 如果您想確定箭頭處的每個箭頭樣式，則需要將箭頭定義擴展為：

\newcommand\DoubleLine[7][4pt]{%
    \path(#2)--(#3)coordinate[at start](h1)coordinate[at end](h2);
    \draw[#4] ($(h1)!#1!90:(h2)$)  to ["#6"]   ($(h2)!#1!-90:(h1)$);
    \draw[#5] ($(h1)!#1!-90:(h2)$) to ["#7" '] ($(h2)!#1!90:(h1)$);
    }

並將你的雙行寫成

\DoubleLine{s}{a}{<-,very thick,black}{->,very thick,red}{1}{2}

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